Maruzen APSII SV does not come with adjustable hop-up stock Stalker.
Poor airseal on the piston/cylinder heads could be the issue here. Or the barrel is in dire need of a cleaning.
There is a long list of reasons why the round is not coming down the barrel, but I doubt this is a hopup issue because its a non-adjust. I would suggest investing in either the PDI or areochamber units. I suggest the PDI simply because it is much more affordable and you can use any standard inner barrel cut you choose with it.
While you're at it, I would suggest upgrading the bolt and piston as well. There are some APSII builds in the media section as well the upgrade section. All the parts that I would list from my build a few years ago won't do you much since most of those parts now are out of production for almost 2 years.
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